Th-fronting is when people shift the 'th' sound into 'f', classic example being the Cockney accent
The same happened in Latin's ancestor Proto-Italic after they first turned PIE 'd' into 'th'.
This is how 'fountain' is related to 'Danube' #linguistics
The word 'map' was originally a shortening of Old French mapamonde, which descended from Latin mappa mundī (napkin of the world)
mappa came from a Punic and is Semitic word, which makes it a cognate of the Hebrew word for map/tablecloth: מפה
